<template>
  <div id="app">
    <ul v-for="(item,index) in myArr" :key="index">
      <li>{{item}}</li>
    </ul>
    <button @click="chenge">走一走</button>
  </div>
</template>

<script>
export default {
  data() {
    return {
      myArr:["帅哥", "美女", "程序猿"],
    }
  },
  methods:{
    chenge(){
      this.myArr.push(this.myArr[0]),
      this.myArr.shift('shanchu')
    }
  }
  
}
</script>